Adding in Apache License
Merge pull request #2 from nitinmotgi/master

Added Apache License
Adding in Apache License
First cut of ZK client
Added test cases. Also make expireRewatch don't need a RetryStrategy.
Added bunch of RetryStrategies and test cases.
Refactor and adding some more docs.
Added bunch of javadocs and some new test cases.
Simplify implementation and reduce number of callback objects created.
Also added test cases.
More javadocs, address review comments.
Json codec for all the specifications
First cut of simple pure java kafka client
Fix javadoc
Adding kafka
Kafka Connection reuse + correcting BrokerCache + class refactoring
Moving ZK classes around
Correctly stop a EchoServer
Refactoring classes packages.
added snappy compression.
Fix ZK client setData to return error when node not exists.